package com.luwanglin;

public class test {
    public static void main(String[] args) {
        long a = -2147483648L;
        System.out.println(Long.toBinaryString(-a));
        System.out.println("1111111111111111111111111111111110000000000000000000000000000000".length());
        int b = -2147483648;
        System.out.println(Math.abs(b));
    }
}
